EP2483893A1 - Coated insulating films for electric machines and manufacturing process therefor - Google Patents
Coated insulating films for electric machines and manufacturing process thereforInfo
- Publication number
- EP2483893A1 EP2483893A1 EP10784270A EP10784270A EP2483893A1 EP 2483893 A1 EP2483893 A1 EP 2483893A1 EP 10784270 A EP10784270 A EP 10784270A EP 10784270 A EP10784270 A EP 10784270A EP 2483893 A1 EP2483893 A1 EP 2483893A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polymer film
- coating
- film
- inorganic
- insulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 229920006254 polymer film Polymers 0.000 claims abstract description 19
- 230000003628 erosive effect Effects 0.000 claims abstract description 7
- 230000005684 electric field Effects 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 9
- 238000005240 physical vapour deposition Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 3
- 239000012811 non-conductive material Substances 0.000 claims description 3
- 238000003980 solgel method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 238000005229 chemical vapour deposition Methods 0.000 claims 2
- 238000005234 chemical deposition Methods 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 claims 1
- 239000010445 mica Substances 0.000 description 12
- 229910052618 mica group Inorganic materials 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 239000012071 phase Substances 0.000 description 6
- -1 polyethylene terephthalate Polymers 0.000 description 6
- 239000004642 Polyimide Substances 0.000 description 5
- 238000005470 impregnation Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000011112 polyethylene naphthalate Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 3
- 150000004756 silanes Chemical class 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004697 Polyetherimide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910002113 barium titanate Inorganic materials 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001601 polyetherimide Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920012266 Poly(ether sulfone) PES Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 241000282941 Rangifer tarandus Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000203 mixture Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000007704 wet chemistry method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910021494 β-cristobalite Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
Definitions
- the invention relates to a coated insulating film with increased corona resistance in the electric field.
- Corona-stable PI films can be used for the conductor insulation. These films are very expensive and are only offered by one manufacturer. For the main insulation mica coated surface insulation materials are used. Again, this solution is expensive and difficult to handle. There is a risk in the winding that the mica particles peel off.
- As polymer films, ie as a carrier for the mica particles mainly (polyethylene terephthalate) PET, (polyethylene naphthalate) PEN and (polyimide) PI films are used.
- a disadvantage of the known solutions is that the herge ⁇ presented isolations are difficult to use and expensive. For example, in the winding around the conductor low bending radii of the mica coated films can not be realized because the mica otherwise peel off. Since the insulation films generally after the winding impregnated with resin for mechanical stability or, in the case of glimmering mer ambiencen materials already used as a resin-impregnated semi ⁇ imaging (so-called. Resin Rich materials) used ⁇ to, the danger of defect sites in the resin impregnation, the lower the corona resistance, and thus jeopardize the duration reliability of the insulation, at the Isola ⁇ functions after State of the art given.
- Object of the present invention is, therefore, an iso-regulation ⁇ for electrical machines, in particular transformers reindeer, to produce motors generators which exhibit improved corona stability with good insulation of the electrical equipment.
- the subject of the present invention is an electrical surface insulation with high corona stability ge ⁇ erosion in the electric field, a polymer film as a carrier, with one or both sides, partially or over the entire surface applied coating of a closely meshed and thus difficult to be converted into the gas phase inorganic or partially inorganic non-conductive material.
- the subject of the present invention is a process for producing the improved insulation by gas deposition or by wet-chemical processes.
- High corona resistance is present in this case, for example, with a local material removal of less than 250 ym, preferably less than 150 ym, preferably less than 100 ym, in particular be ⁇ preferred from less than 50 ym of mecanicnisolier fürs egg ⁇ ner electrode with a diameter of 6 mm at an E Field load of 6.5 V / ym for 240 hours, equated "Under" an electrode means that the electrode rests directly, but without pressure.
- crosslinking points refers to the ato ⁇ centered centers, the chemical bond between two or more finished molecular parts, also called monomer units produce.
- the inventive compact and smooth coating smaller bending radii can be achieved than is possible with ⁇ play, in the mica-coated films. Difficulties in defect-free impregnation of the mica-coated films can continue to occur in the coated films according to the invention, since the compact, smooth surface of the coating can be easily impregnated. This increases the reliability and durability of the insulation system in use. An improved Wettetz ⁇ ability of the film with the resin through the coating further promotes reliability.
- the coating material of a refractory inorganic material such as a ceramic material such as a titanate or of a partially inorganic material such as the so-called non-metallic hybrid polymers.
- the inorganic material is, for example, a nitride such as the trisilicon tetranitride S1 3 N 4 having a melting point of 1900 ° C.
- phosphates or oxides Kings ⁇ NEN are used here to advantage.
- Further materials may be: silicon carbide (SiC), barium titanate (BaTiO3), silicon nitride (SiN) or derivatives of these materials as well as all other ceramic compounds.
- the inorganic or partially inorganic non-conductive coatings can be applied to the polymer films by means of low-pressure PVD or low-pressure CVD or atmospheric-pressure plasma polymer coating methods.
- silanes and siloxanes can be applied as coatings to the polymer films by way of the sol-gel process, which form, for example, a SiO backbone framework, which is cross-linked and thus again the property that the coating is difficult to evaporate fulfilled.
- Prepo- mers for the sol-gel synthesis come silanes, siloxanes, or ⁇ ganisch modified silanes or mixtures thereof in question.
- the properties of the sol-gel layers can be adapted.
- layers can be realized which are based on interpenetrating networks of such sol-gel condensates and the organic polymers.
- Suitable polymer films more may be enumerated, for example, is suitable standard materials such as polyethylene ⁇ (PE), polypropylene (PP), polyvinyl chloride (PVC), polyether terephthalate (PET) or polyethylene naphthalate (PEN), as well as other thermoset and high temperature stable Fo ⁇
- PE polyethylene ⁇
- PVC polypropylene
- PVC polyvinyl chloride
- PET polyether terephthalate
- PEN polyethylene naphthalate
- PI polyimide
- PEEK polyetheretherketone
- PEI polyetherimide
- PES polyethersulfone
- LCP liquid crystal polymer
- the thickness of the layer may vary, for example, it may be less than 500 ⁇ , in particular less than 100 ⁇ and more preferably between 5 nm and 150 ⁇ . It will be evident ⁇ Lich that applied Schich ⁇ th are significantly thicker by wet chemical methods than those applied by vacuum deposition in layers. The wet-chemically generated
- PVD or CVD coatings of around 50 nm can produce a significant improvement in the corona resistance of the films against partial electrical discharge.
- One possibility is the coating by means of wet-chemical materials, which are applied in the sol-gel process. Even in this case, significant improvements can already be achieved by thin layers in the range of a few ym. Both the gas phase deposition and the sol-gel coating can be easily automated, thus providing highly scalable coating processes.
- Expensive erosion stable PI-foil or mica coated films of PET or PEN for the partial or Hauptleiterisolie ⁇ tion can be replaced by these low-cost coated films.
- the handling of the films, for example, in a winding process is much easier than for a mica particle-coated film, since due to the compact coating flaking of the mica particles can not auftre ⁇ th. This also allows smaller bending radii to be realized.
- the resin impregnation of the coated films is also more reliable than the impregnation of the mica particles.
- a risk of life-reducing defects due to defective impregnation of the mica tape does not occur in the coated film. Due to the compact and smooth coating, depending on the version, in general even an improved resin wetting compared to the uncoated foil is achieved.
- the figure shows the scheme of construction of an exemplary embodiment of the film according to the invention.
- the coating 2 and 3 are made of finely crosslinked and difficult to be converted into the gas phase inorganic or partially inorganic non-conductive material.
- This coating which is also referred to as the "electrical barrier layer” has a higher rigidity and brittleness than the polymer film, which usually also reduces the elongation at break of the polymer film elasticizing layer 4 or 5 is coated.
- ⁇ are all suitable elastic polymeric Be Anlagenungssys- systems such as PU, epoxy resin, silicones and / or acrylates, etc.
- These elasticizing compensating layer has, in a part before ⁇ exemplary embodiment, layer thicknesses in the range of 0.1 100 bi It is applied wet-chemically by means of printing, doctoring, dipping or other inline-capable processes advantageously in the roll-to-roll process.
- This invention discloses for the first time a coating of standard PET films with inorganic or partially inorganic layers such as SiOx, Al 2 O 3, Si 3 N 4, etc., which can be applied by low pressure PVD, low pressure CVD, or atmospheric pressure plasma polymer coating processes , which simultaneously leads to increased corona stability of the film and an at least constant mechanical Festig ⁇ speed (even under thermal aging) as for the uncoated film.
- inorganic or partially inorganic layers such as SiOx, Al 2 O 3, Si 3 N 4, etc.
- the resistance to erosion in the electric field is significantly improved in the case of the polymer film under permanent partial discharge loading.
- all non-metallic, non-conductive layers with high crosslinking density and inorganic proportions are suitable.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Beschreibung description
Beschichtete Isolationsfolien für elektrische Maschinen und Herstellungsverfahren dazu Coated insulating films for electrical machines and manufacturing processes thereto
Die Erfindung betrifft eine beschichtete Isolationsfolie mit gesteigerter Koronabeständigkeit im elektrischen Feld. The invention relates to a coated insulating film with increased corona resistance in the electric field.
Elektrische Maschinen (Transformatoren, Motoren, Generatoren) besitzen je nach Leistung und Konstruktionsprinzip ein komplexes Isolierungssystem. Dabei werden in unterschiedlichen Bereichen Folienwerkstoffe als Isolierung eingesetzt. Diese Folienisolierstoffe bestehen aus thermoplastischen oder chemisch vernetzten Polymerfolien. Es kommt eine überschaubare Anzahl von Folienwerkstoffen in Frage, welche die mechanischen, elektrischen und thermischen Anforderungen erfüllen. Im Falle der Motoren und Generatoren werden entsprechende Folien für Haupt- und Teilleiterisolierung um den Leiter gewickelt . Electrical machines (transformers, motors, generators) have a complex insulation system depending on their performance and design principle. In this case, film materials are used as insulation in different areas. These Folienisolierstoffe consist of thermoplastic or chemically crosslinked polymer films. There is a manageable number of film materials in question, which meet the mechanical, electrical and thermal requirements. In the case of motors and generators, corresponding foils for main and sub-conductor insulation are wound around the conductor.
Für die Teilleiterisolierung können koronastabile PI-Folien eingesetzt werden. Diese Folien sind sehr teuer und werden nur von einem Hersteller angeboten. Für die Hauptisolierung kommen glimmerbeschichtete Flächenisolierstoffe zum Einsatz. Auch diese Lösung ist teuer und zu dem im Handling schwierig. Es besteht bei der Wicklung die Gefahr, dass die Glimmerpartikel abblättern. Als Polymerfolien, also als Träger für die Glimmerpartikel, kommen hauptsächlich ( Polyethylenterephtha- lat) PET-, (Polyethylennaphthalat) PEN- und (Polyimid) PI- Fo- lien zum Einsatz. Corona-stable PI films can be used for the conductor insulation. These films are very expensive and are only offered by one manufacturer. For the main insulation mica coated surface insulation materials are used. Again, this solution is expensive and difficult to handle. There is a risk in the winding that the mica particles peel off. As polymer films, ie as a carrier for the mica particles, mainly (polyethylene terephthalate) PET, (polyethylene naphthalate) PEN and (polyimide) PI films are used.
Nachteilig an den bekannten Lösungen ist, dass die so herge¬ stellten Isolierungen schwierig in der Handhabung und teuer sind. Beispielsweise können bei der Wicklung um den Leiter geringe Biegeradien der glimmerbeschichteten Folien nicht realisiert werden, weil die Glimmer sonst Abblättern. Da die Isolationsfolien ganz generell nach der Wicklung mit Harz zur mechanischen Stabilität imprägniert oder, im Falle der glim- merhaltigen Materialien, bereits als harzimprägniertes Halb¬ zeug verwendet (sog. Resin Rieh Materialien) eingesetzt wer¬ den, ist die Gefahr von Defektstellen in der Harzimprägnierung, die die Koronabeständigkeit herabsetzen und damit die Dauerzuverlässigkeit des Isolierung gefährden, bei den Isola¬ tionen nach dem Stand der Technik gegeben. A disadvantage of the known solutions is that the herge ¬ presented isolations are difficult to use and expensive. For example, in the winding around the conductor low bending radii of the mica coated films can not be realized because the mica otherwise peel off. Since the insulation films generally after the winding impregnated with resin for mechanical stability or, in the case of glimmering merhaltigen materials already used as a resin-impregnated semi ¬ imaging (so-called. Resin Rich materials) used ¬ to, the danger of defect sites in the resin impregnation, the lower the corona resistance, and thus jeopardize the duration reliability of the insulation, at the Isola ¬ functions after State of the art given.
Aufgabe der vorliegenden Erfindung ist es deshalb, eine Iso¬ lierung für elektrische Maschinen, insbesondere Transformato- ren, Motoren, Generatoren herzustellen, die bei guter Isolierung der elektrischen Maschinen eine verbesserte Koronastabilität zeigen. Object of the present invention is, therefore, an iso-regulation ¬ for electrical machines, in particular transformers reindeer, to produce motors generators which exhibit improved corona stability with good insulation of the electrical equipment.
Diese Aufgabe wird durch den Gegenstand der vorliegenden An- sprüche zusammen mit der Beschreibung und den Figuren gelöst. This object is solved by the subject matter of the present claims together with the description and the figures.
Demgemäß ist Gegenstand der vorliegenden Erfindung eine elektrische Flächenisolierung mit hoher Koronastabilität ge¬ gen Erosion im elektrischen Feld, die eine Polymerfolie als Träger, mit ein- oder beidseitig, teilweise oder ganzflächig aufgebrachter Beschichtung aus einem engmaschig vernetztem und dadurch schwer in die Gasphase zu überführenden anorganischen oder teilweise anorganischem nichtleitendem Material umfasst. Außerdem ist Gegenstand der vorliegenden Erfindung ein Verfahren zur Herstellung der verbesserten Isolation durch Gasabscheidung oder über nasschemische Verfahren. Accordingly, the subject of the present invention is an electrical surface insulation with high corona stability ge ¬ erosion in the electric field, a polymer film as a carrier, with one or both sides, partially or over the entire surface applied coating of a closely meshed and thus difficult to be converted into the gas phase inorganic or partially inorganic non-conductive material. In addition, the subject of the present invention is a process for producing the improved insulation by gas deposition or by wet-chemical processes.
„Hohe Koronabeständigkeit" wird vorliegend beispielsweise mit einem lokalen Materialabtrag von kleiner 250 ym, bevorzugt kleiner 150 ym , bevorzugt kleiner 100 ym, insbesondere be¬ vorzugt von kleiner 50 ym des Flächenisolierstoffes unter ei¬ ner Elektrode mit Durchmesser von 6 mm bei einer E- Feldbelastung von 6,5 V/ym für 240 Stunden, gleichgesetzt. „Unter" einer Elektrode heißt dabei, dass die Elektrode di- rekt, aber ohne Druck aufliegt. "High corona resistance" is present in this case, for example, with a local material removal of less than 250 ym, preferably less than 150 ym, preferably less than 100 ym, in particular be ¬ preferred from less than 50 ym of Flächenisolierstoffes egg ¬ ner electrode with a diameter of 6 mm at an E Field load of 6.5 V / ym for 240 hours, equated "Under" an electrode means that the electrode rests directly, but without pressure.
Als „Vernetzungspunkte" werden innerhalb der Schicht die ato¬ maren Zentren bezeichnet, die chemische Bindung zwischen zwei oder mehr fertigen Molekülteilen, auch Monomereinheiten genannt, herstellen. Within the layer, the term "crosslinking points" refers to the ato ¬ centered centers, the chemical bond between two or more finished molecular parts, also called monomer units produce.
Als „schwer in die Gasphase zu überführende" Materialien wer- den diese Beschichtungen bezeichnet, weil sie bei der während der Glimmentladung auftretenden Temperaturbelastung einen hohen Widerstand gegen Materialzersetzung oder Kettenspaltung aufweisen (Molmassenabbau) . Daher auch die Bevorzugung anorganischer oder Hybrid-anorganischer Materialien, die im Fol- genden auch als „teilanorganisch" bezeichnet werden. These coatings are referred to as "difficult-to-gas phase" materials because they exhibit high resistance to decomposition of the material or chain cleavage during the temperature load occurring during the glow discharge (molecular weight reduction) hereinafter also referred to as "partially inorganic".
Als anorganisch werden dabei alle nicht kohlenstoffhaltigen atomaren Zentren bezeichnet. Als „engmaschig" wird hier die im Vergleich zu organischenInorganic all non-carbon atomic centers are referred to. As "close-knit" here is compared to organic
Polymeren engere Verknüpfung anorganischer Polymere bezeichnet . Polymers closer linkage of inorganic polymers called.
Durch die erfindungsgemäße kompakte und glatte Beschichtung können geringere Biegeradien realisiert werden, als dies bei¬ spielsweise bei den glimmerbeschichteten Folien möglich ist. Schwierigkeiten beim defektfreien Imprägnieren der glimmerbeschichteten Folien können weiterhin bei den erfindungsgemäßen beschichteten Folien nicht auftreten, da die kompakte, glatte Oberfläche der Beschichtung problemlos imprägniert werden kann. Dies steigert die Zuverlässigkeit und Dauerhaftigkeit des Isolationssystems im Einsatz. Eine verbesserte Benetzbar¬ keit der Folie mit dem Harz durch die Beschichtung fördert die Zuverlässigkeit weiterhin. The inventive compact and smooth coating smaller bending radii can be achieved than is possible with ¬ play, in the mica-coated films. Difficulties in defect-free impregnation of the mica-coated films can continue to occur in the coated films according to the invention, since the compact, smooth surface of the coating can be easily impregnated. This increases the reliability and durability of the insulation system in use. An improved Wettetz ¬ ability of the film with the resin through the coating further promotes reliability.
Durch die vorgeschlagene Beschichtung der Polymerfolie wird der Widerstand gegen Erosion im elektrischen Feld (sog. Koronastabilität) bei dauerhafter Teilentladungsbelastung deutlich verbessert. Dies wird unter anderem darauf zurückge- führt, dass die anorganische oder teilanorganische Beschich¬ tung vergleichsweise engmaschig vernetzt ist und auch schwer in die Gasphase überführbar ist. Nach einer vorteilhaften Ausgestaltung der Erfindung ist das Beschichtungsmaterial aus einem hochschmelzenden anorganisches Material wie einem keramischen Material z.B. ein Tita- nat oder aus einem teilanorganischen Material wie den so ge- nannten nichtmetallischen Hybridpolymeren. Nach einer anderen Ausführungsform ist das anorganische Material beispielsweise ein Nitrid wie das Trisiliciumtetranitrid S13N4 mit einem Schmelzpunkt von 1900°C. Aber auch Phosphate oder Oxide kön¬ nen hier vorteilhaft eingesetzt werden. Insbesondere vorteil- haft ist Aluminiumoxid AI2O3 mit einem Schmelzpunkt von 2045°C und SiOx, das in einer engmaschig vernetzten Modifikation einen Schmelzpunkt der Quarz-Modifikation ß-Cristobalit (x = 2) von 1705°C hat. Weitere Materialien können sein: Siliziumcar- bid (SiC), Bariumtitanat (BaTi03) , Siliziumnitrid (SiN)oder Derivate dieser Materialien sowie alle weiteren keramischen Verbindungen . The proposed coating of the polymer film significantly improves the resistance to erosion in the electric field (so-called corona stability) during permanent partial discharge loading. This will lead zurückge- among other things, that the inorganic or teilanorganische Beschich ¬ processing is comparatively closely linked and can be moved heavily into the gas phase. According to an advantageous embodiment of the invention, the coating material of a refractory inorganic material such as a ceramic material such as a titanate or of a partially inorganic material such as the so-called non-metallic hybrid polymers. In another embodiment, the inorganic material is, for example, a nitride such as the trisilicon tetranitride S1 3 N 4 having a melting point of 1900 ° C. But phosphates or oxides Kings ¬ NEN are used here to advantage. Particularly advantageous is aluminum oxide Al 2 O 3 with a melting point of 2045 ° C and SiO x , which has a melting point of the quartz modification ß-cristobalite (x = 2) of 1705 ° C in a close-knit crosslinked modification. Further materials may be: silicon carbide (SiC), barium titanate (BaTiO3), silicon nitride (SiN) or derivatives of these materials as well as all other ceramic compounds.
Zur Herstellung der Beschichtung wird auf an sich bekannte Verfahren zurückgegriffen. Dabei lassen sich grundsätzlich zwei Wege beschreiten, zum einen der nasschemische über das Sol-Gel-Beschichtungsverfahren und zum zweiten die Abschei- dungsverfahren aus der Gasphase, die teilweise unter Anwendung von Plasmaverfahren durchgeführt werden. Diese Verfahren dienen alle dazu, nichtleitende, anorganische oder teilanorganische Beschichtungen herzustellen, die engmaschig vernetzt und/oder sonst wie schwer in die Gasphase überführbar sind. Das erhöht die Koronabeständigkeit. So lassen sich beispielsweise über Niederdruck-PVD oder Nie- derdruck-CVD- oder Atmosphärendruck-Plasmapolymer- Beschichtungsverfahren die anorganischen oder teilanorganischen nichtleitenden Beschichtungen auf die Polymerfolien aufbringen . For the preparation of the coating recourse is made to known methods. In principle, two approaches can be taken, one being the wet-chemical via the sol-gel coating process and the second the vapor phase deposition processes, which are partly carried out using plasma processes. These processes all serve to produce non-conductive, inorganic or partially inorganic coatings which are closely cross-linked and / or otherwise difficult to convert into the gas phase. This increases the corona resistance. Thus, for example, the inorganic or partially inorganic non-conductive coatings can be applied to the polymer films by means of low-pressure PVD or low-pressure CVD or atmospheric-pressure plasma polymer coating methods.
Ebenso lassen sich über das Sol-Gel-Verfahren Silane und Si- loxane als Beschichtungen auf die Polymerfolien aufbringen, die beispielsweise ein SiO-backbone-Gerüst bilden, das engma- schig vernetzt ist und somit wieder die Eigenschaft, dass die Beschichtung nur schwer verdampfbar ist, erfüllt. Als Prepo- lymere für die Sol-Gel-Synthese kommen Silane, Siloxane, or¬ ganisch modifizierte Silane bzw. deren Mischungen in Frage. Durch die Einstellung des Anorganik- zu Organik-Anteil über die geeignete Wahl der Prepolymere können die Eigenschaften der Sol-Gel-Schichten angepasst werden. Weiterhin können Schichten realisiert werden, die auf interpenetrierenden Netzwerken solcher Sol-Gel-Kondensate und der organischen Po- lymere basieren. Likewise, silanes and siloxanes can be applied as coatings to the polymer films by way of the sol-gel process, which form, for example, a SiO backbone framework, which is cross-linked and thus again the property that the coating is difficult to evaporate fulfilled. As Prepo- mers for the sol-gel synthesis come silanes, siloxanes, or ¬ ganisch modified silanes or mixtures thereof in question. By adjusting the inorganic to organic content via the appropriate choice of the prepolymers, the properties of the sol-gel layers can be adapted. Furthermore, layers can be realized which are based on interpenetrating networks of such sol-gel condensates and the organic polymers.
Als geeignete Polymerfolien können mehrere aufgezählt werden, beispielsweise geeignet ist Standardmaterialien wie Polyethy¬ len (PE), Polypropylen (PP) , Polyvinylchlorid (PVC) , Polye- thylenterephthalat (PET) oder Polyethylennaphthalat (PEN), aber auch andere duroplastische und hochtemperaturstabile Fo¬ lien wie Polyimid (PI), Polyetheretherketon (PEEK) , Polyethe- rimid (PEI), Polyethersulfon (PES) , Liquid Crystal Polymer (LCP) , etc. sind einsetzbar. Suitable polymer films more may be enumerated, for example, is suitable standard materials such as polyethylene ¬ (PE), polypropylene (PP), polyvinyl chloride (PVC), polyether terephthalate (PET) or polyethylene naphthalate (PEN), as well as other thermoset and high temperature stable Fo ¬ Such as polyimide (PI), polyetheretherketone (PEEK), polyetherimide (PEI), polyethersulfone (PES), liquid crystal polymer (LCP), etc. can be used.
Die Dicke der Schicht kann variieren, beispielsweise kann sie kleiner 500μη sein, insbesondere kleiner 100 μιη und besonders bevorzugt zwischen 5 nm und 150 μιη. Dabei ist es offensicht¬ lich, dass durch nasschemische Methoden aufgebrachte Schich¬ ten deutlich dicker sind als die durch Abscheidungen in Vakuum aufgebrachten Schichten. Die nasschemisch erzeugten The thickness of the layer may vary, for example, it may be less than 500μη, in particular less than 100 μιη and more preferably between 5 nm and 150 μιη. It will be evident ¬ Lich that applied Schich ¬ th are significantly thicker by wet chemical methods than those applied by vacuum deposition in layers. The wet-chemically generated
Schichten bewegen sich daher im Bereich von 0,1 bis 150 μιτι, während die durch Abscheidung erzeugten Schichten durchaus schon im Bereich von 1 bis 50 nm Dicke einen Effekt zeigen können . Therefore, layers move in the range of 0.1 to 150 μιτι, while the layers produced by deposition quite well in the range of 1 to 50 nm thickness can show an effect.
So kann bereits durch sehr dünne PVD - bzw. CVD- Beschichtungen um 50 nm eine deutliche Verbesserung der Koronabeständigkeit der Folien gegen elektrische Teilentladung erzeugt werden. Eine Möglichkeit ist die Beschichtung mittels nasschemischer Materialien, die im Sol-Gel-Prozess aufgebracht werden. Auch in diesem Fall können bereits durch dünne Schichten im Bereich von wenigen ym deutliche Verbesserungen erreicht wer- den. Sowohl die Abscheidung aus der Gasphase als auch die Sol-Gel-Beschichtung können gut automatisiert werden und stellen somit gut skalierbare Beschichtungsprozesse dar. Thus, even very thin PVD or CVD coatings of around 50 nm can produce a significant improvement in the corona resistance of the films against partial electrical discharge. One possibility is the coating by means of wet-chemical materials, which are applied in the sol-gel process. Even in this case, significant improvements can already be achieved by thin layers in the range of a few ym. Both the gas phase deposition and the sol-gel coating can be easily automated, thus providing highly scalable coating processes.
Teure erosionsstabile PI-Folien oder glimmerbeschichtete Fo- lien aus PET oder PEN für die Teil- bzw. Hauptleiterisolie¬ rung können durch diese kostengünstigen beschichteten Folien ersetzt werden. Zudem ist das Handling der Folien beispielsweise in einem Wickelprozess deutlich einfacher als für eine glimmerpartikelbeschichtete Folie, da aufgrund der kompakten Beschichtung ein Abblättern der Glimmerpartikel nicht auftre¬ ten kann. So können auch kleinere Biegeradien realisiert werden . Expensive erosion stable PI-foil or mica coated films of PET or PEN for the partial or Hauptleiterisolie ¬ tion can be replaced by these low-cost coated films. In addition, the handling of the films, for example, in a winding process is much easier than for a mica particle-coated film, since due to the compact coating flaking of the mica particles can not auftre ¬ th. This also allows smaller bending radii to be realized.
Die Harzimprägnierung der beschichteten Folien ist weiterhin zuverlässiger möglich als die Durchimprägnierung der Glimmerpartikel. Eine Gefahr von lebensdauerreduzierenden Fehlstellenbildung infolge defekthaltiger Durchimprägnierung des Glimmerbandes tritt bei der beschichteten Folie nicht auf. Durch die kompakte und glatte Beschichtung wird - je nach Ausführung - in der Regel sogar eine verbesserte Harzbenet- zung im Vergleich zur unbeschichteten Folie erreicht. The resin impregnation of the coated films is also more reliable than the impregnation of the mica particles. A risk of life-reducing defects due to defective impregnation of the mica tape does not occur in the coated film. Due to the compact and smooth coating, depending on the version, in general even an improved resin wetting compared to the uncoated foil is achieved.
Im Folgenden wird die Erfindung noch anhand von einer Figur verdeutlicht : In the following the invention will be clarified with reference to a figure:
Die Figur zeigt das Schema des Aufbaus einer beispielhaften Ausführungsform der Folie gemäß der Erfindung. The figure shows the scheme of construction of an exemplary embodiment of the film according to the invention.
Zu erkennen ist mittig eine Polymerfolie 1, die in der hier gezeigten Ausführungsform beidseitig und nicht nur einseitig beschichtet ist. Auf beiden Seiten der Folie 1 befindet sich daher die Be- schichtung 2 und 3 aus engmaschig vernetztem und schwer in die Gasphase zu überführenden anorganischen oder teilanorganischen nichtleitendem Material. Diese auch als „elektrische Barriereschicht" bezeichnete Beschichtung weist im Vergleich zur Polymerfolie eine höhere Steifigkeit und Sprödigkeit auf. Dadurch wird in der Regel auch die Reißdehnung der Polymerfolie verringert. Um diesem negativen Effekt entgegen zu wirken, wird diese in einer besonders vorteilhaften Ausführung mit einer elastifizierenden Schicht 4 oder 5 beschichtet. Da¬ für eignen sich alle elastischen polymeren Beschichtungssys- teme wie PU, Epoxidharz, Silikone und/oder Acrylate, etc. Diese elastifizierende Ausgleichsschicht weist in einer vor¬ teilhaften Ausführung Schichtdicken im Bereich von 0,1 bi 100 ym auf. Sie wird nasschemisch über Druck-, Rakel-, Tauchoder andere inlinefähige Verfahren vorteilhaft im Rolle-zu- Rolle-Prozess aufgetragen. Evident is centrally a polymer film 1, which is coated on both sides and not only one side in the embodiment shown here. On both sides of the film 1, therefore, the coating 2 and 3 are made of finely crosslinked and difficult to be converted into the gas phase inorganic or partially inorganic non-conductive material. This coating, which is also referred to as the "electrical barrier layer", has a higher rigidity and brittleness than the polymer film, which usually also reduces the elongation at break of the polymer film elasticizing layer 4 or 5 is coated. as for ¬ are all suitable elastic polymeric Beschichtungssys- systems such as PU, epoxy resin, silicones and / or acrylates, etc. These elasticizing compensating layer has, in a part before ¬ exemplary embodiment, layer thicknesses in the range of 0.1 100 bi It is applied wet-chemically by means of printing, doctoring, dipping or other inline-capable processes advantageously in the roll-to-roll process.
Durch diese Erfindung wird erstmals eine Beschichtung von Standard-PET-Folien mit anorganischen oder teilanorganischen Schichten wie SiOx, A1203, Si3N4 etc., die über Niederdruck- PVD-, Niederdruck-CVD- , oder Atmosphärendruck-Plasmapolymer- Beschichtungsverfahren aufgebracht werden können, offenbart, welche gleichzeitig zu einer erhöhten Koronastabilität der Folie und einer zumindest gleichbleibende mechanische Festig¬ keit (auch unter thermischer Alterung) wie für die unbeschichtete Folie führt. This invention discloses for the first time a coating of standard PET films with inorganic or partially inorganic layers such as SiOx, Al 2 O 3, Si 3 N 4, etc., which can be applied by low pressure PVD, low pressure CVD, or atmospheric pressure plasma polymer coating processes , which simultaneously leads to increased corona stability of the film and an at least constant mechanical Festig ¬ speed (even under thermal aging) as for the uncoated film.
Durch die erfindungsgemäße Beschichtung einer Polymerfolie wird bei der Polymerfolie der Widerstand gegen Erosion im elektrischen Feld (sog. Koronastabilität) bei dauerhafter Teilentladungsbelastung deutlich verbessert. Es eignen sich prinzipiell alle nichtmetallischen, nichtleitenden Schichten mit hoher Vernetzungsdichte und anorganischen Anteilen. As a result of the coating of a polymer film according to the invention, the resistance to erosion in the electric field (so-called corona stability) is significantly improved in the case of the polymer film under permanent partial discharge loading. In principle, all non-metallic, non-conductive layers with high crosslinking density and inorganic proportions are suitable.
Ebenso kann durch hochvernetzte nasschemische Siloxan-Likewise, by highly crosslinked wet-chemical siloxane
Schichten bzw. alle Arten von anorganischen oder hybridpoly- meren Sol-Gel-Schichten die Koronabeständigkeit deutlich gesteigert werden. Ein typisches Beispiel für die Beständigkeitssteigerung einer mit Sol-Gel-Beschichtung beschichteten 50 ym dicken PET-Folie gegen elektrische Erosion durch Teilentladung ist optisch nachweisbar. Layers or all types of inorganic or hybrid polymer sol-gel layers, the corona resistance significantly increased. A typical example of the increase in resistance of a sol-gel coated 50-ym thick PET film against electrical erosion by partial discharge is optically detectable.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009052432A DE102009052432A1 (en) | 2009-11-10 | 2009-11-10 | Coated insulating films for electrical machines and manufacturing processes thereto |
| PCT/EP2010/066492 WO2011057905A1 (en) | 2009-11-10 | 2010-10-29 | Coated insulating films for electric machines and manufacturing process therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2483893A1 true EP2483893A1 (en) | 2012-08-08 |
Family
ID=43533343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10784270A Withdrawn EP2483893A1 (en) | 2009-11-10 | 2010-10-29 | Coated insulating films for electric machines and manufacturing process therefor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20120225319A1 (en) |
| EP (1) | EP2483893A1 (en) |
| CN (1) | CN102696076A (en) |
| DE (1) | DE102009052432A1 (en) |
| WO (1) | WO2011057905A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011080620B4 (en) * | 2011-08-08 | 2014-06-05 | Siemens Aktiengesellschaft | Method for coating an insulation component and insulation component, and electrically conductive heating cable |
| DE102011080884A1 (en) * | 2011-08-12 | 2013-02-14 | Siemens Aktiengesellschaft | Coating with high corona resistance, as well as manufacturing method thereto |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5281600A (en) * | 1975-12-27 | 1977-07-08 | Nitto Electric Ind Co | Method of electric insulation |
| JPH01173513A (en) * | 1987-12-26 | 1989-07-10 | Toray Ind Inc | Film for electrical insulation |
| JPH01252765A (en) * | 1988-03-31 | 1989-10-09 | Kanegafuchi Chem Ind Co Ltd | Aromatic polyester film with improved surface hardness |
| JPH06192832A (en) * | 1992-12-28 | 1994-07-12 | Kanegafuchi Chem Ind Co Ltd | Thin film |
| DE4412906C1 (en) * | 1994-04-14 | 1995-07-13 | Fraunhofer Ges Forschung | Ion-assisted vacuum coating |
| US6699944B1 (en) * | 1998-10-28 | 2004-03-02 | Kaneka Corporation | Acrylic rubber composition |
| JP2002127295A (en) * | 2000-10-24 | 2002-05-08 | Toray Ind Inc | Laminated film |
| JP3920627B2 (en) * | 2001-11-09 | 2007-05-30 | ヤマウチ株式会社 | Cushion material for heat press |
| WO2005055250A1 (en) * | 2003-12-03 | 2005-06-16 | Prysmian Cavi E Sistemi Energia S.R.L. | Impact resistant cable |
| US7268293B2 (en) * | 2004-06-15 | 2007-09-11 | Siemen Power Generation, Inc. | Surface coating of lapped insulation tape |
| CN201041931Y (en) * | 2006-04-06 | 2008-03-26 | 罗东豪 | A jacket tube |
| CN101490124A (en) * | 2006-07-20 | 2009-07-22 | Abb研究有限公司 | Antivirus mask and filter material |
| WO2009062543A1 (en) * | 2007-11-13 | 2009-05-22 | Abb Research Ltd | Fiber-reinforced composite system as electrical insulation |
-
2009
- 2009-11-10 DE DE102009052432A patent/DE102009052432A1/en not_active Ceased
-
2010
- 2010-10-29 WO PCT/EP2010/066492 patent/WO2011057905A1/en not_active Ceased
- 2010-10-29 EP EP10784270A patent/EP2483893A1/en not_active Withdrawn
- 2010-10-29 CN CN2010800511172A patent/CN102696076A/en active Pending
-
2011
- 2011-10-29 US US13/509,198 patent/US20120225319A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011057905A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009052432A1 (en) | 2011-06-09 |
| US20120225319A1 (en) | 2012-09-06 |
| WO2011057905A1 (en) | 2011-05-19 |
| CN102696076A (en) | 2012-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2721616B1 (en) | Insulation systems with improved resistance to partial discharge, production method for this | |
| EP3394861A1 (en) | Insulated electric conductor | |
| EP3442098A1 (en) | Coil for rotating electrical machine, method for producing coil for rotating electrical machine, mica tape, cured product of mica tape, and insulating material | |
| EP2712462A1 (en) | Insulation systems having improved partial discharge resistance, and method for producing same | |
| DE102011079489A1 (en) | Method for producing a strip for an electrical insulation system | |
| KR20110116162A (en) | Passive electric device and manufacturing method of passive electric device | |
| JP2008229849A (en) | Dielectric film and electronic component using the film | |
| DE102012207535A1 (en) | Electrical tape material, method of manufacture and use therefor | |
| EP3493920B1 (en) | Passive electrical component with coating to improve the loading capacity | |
| WO2012013543A2 (en) | Insulation system having improved partial discharge strength | |
| EP2483893A1 (en) | Coated insulating films for electric machines and manufacturing process therefor | |
| EP2742513B1 (en) | Coating having high corona resistance and production method therefor | |
| EP2675852B1 (en) | Method for producing a porous particle composite for an electrical insulating paper | |
| DE102017125178B4 (en) | Electrical component with a self-healing lacquer coating, method for its production, method for self-healing of the electrical component after electrical breakdown and use of a lacquer coating as a self-healing coating | |
| KR20120030066A (en) | Laminate of ceramic insulating layer and metal layer, and method for producing same | |
| WO2022013036A1 (en) | Insulating system made of solid insulating material and impregnating resin | |
| DE102019215019A1 (en) | Method for manufacturing an insulated superconducting coil, insulated superconducting coil, electrical machine and hybrid electrical aircraft | |
| WO2017055004A1 (en) | Impregnable electrical insulating paper and method for producing electrical insulating paper | |
| DE102023205219A1 (en) | Paint formulation, isolation thereof and use | |
| DE102014204416A1 (en) | Insulation tape, its use as electrical insulation for electrical machines, electrical insulation and method of making the insulation tape | |
| DE102023200109A1 (en) | Method for producing a polymeric insulation layer for a conductor strand comprising at least one carbon conductor | |
| EP4447283A1 (en) | Insulation system | |
| WO2013144375A1 (en) | Semiconductor device and method for producing a glass-like layer | |
| JPH05162249A (en) | Insulating film for printed wiring board | |
| JPH11111076A (en) | Oil immersion power cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20120502 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| INTG | Intention to grant announced |
Effective date: 20140917 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20150128 |